Chapter 5Sources and Sinks
Chapter 5 Sources and Sinks
“ Among the many problems in heat-conduction analogous to those inground-water hydraulics are thoseconcerning sources and sinks, sourcesandbeing analogous to recharging wellssinks to ordinary discharging wells-- C.V. Theis, 1935
“Among the many problems in heatconduction analogous to those in ground-water hydraulics are those concerning sources and sinks, sources being analogous to recharging wells and sinks to ordinary discharging wells.” - C.V. Theis, 1935
Water may enter or leave a model in one oftwo ways - through the boundaries, asdetermined by the boundary conditions, orthrough sources and sinks within theinterior of the grid
Water may enter or leave a model in one of two ways – through the boundaries, as determined by the boundary conditions, or through sources and sinks within the interior of the grid
5.1 Injection and Pumping WellsFinite Difference ModelsIn finite difference models, the noderepresents the finite difference cell. Hence, apoint source or sink of water is injected orextracted over the volume of aquiferrepresented by the cell that contains the pointsource orsink
5.1 Injection and Pumping Wells Finite Difference Models In finite difference models, the node represents the finite difference cell. Hence, a point source or sink of water is injected or extracted over the volume of aquifer represented by the cell that contains the point source or sink
In a two-dimensional areal model, however thenode represents the thickness of the aquifer.Hence, it is implicitly assumed that the wellpenetrates the full thickness of the aquifer.In three-dimensional models it is possible tosimulate the effects of partial penetrationbecause pumping or injection nodes can beplaced in any layer. The user specifies thepumping rate and location of the well screen
In a two-dimensional areal model, however the node represents the thickness of the aquifer. Hence, it is implicitly assumed that the well penetrates the full thickness of the aquifer. In three-dimensional models it is possible to simulate the effects of partial penetration because pumping or injection nodes can be placed in any layer. The user specifies the pumping rate and location of the well screen